/*
 * Copyright (C) 2008 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.smartandroid.sa.json;

import com.smartandroid.sa.json.annotations.Since;
import com.smartandroid.sa.json.annotations.Until;
import com.smartandroid.sa.json.internal.$Gson$Preconditions;

/**
 * This strategy will exclude any files and/or class that are passed the
 * {@link #version} value.
 * 
 * @author Joel Leitch
 */
final class VersionExclusionStrategy implements ExclusionStrategy {
	private final double version;

	VersionExclusionStrategy(double version) {
		$Gson$Preconditions.checkArgument(version >= 0.0D);
		this.version = version;
	}

	public boolean shouldSkipField(FieldAttributes f) {
		return !isValidVersion(f.getAnnotation(Since.class),
				f.getAnnotation(Until.class));
	}

	public boolean shouldSkipClass(Class<?> clazz) {
		return !isValidVersion(clazz.getAnnotation(Since.class),
				clazz.getAnnotation(Until.class));
	}

	private boolean isValidVersion(Since since, Until until) {
		return (isValidSince(since) && isValidUntil(until));
	}

	private boolean isValidSince(Since annotation) {
		if (annotation != null) {
			double annotationVersion = annotation.value();
			if (annotationVersion > version) {
				return false;
			}
		}
		return true;
	}

	private boolean isValidUntil(Until annotation) {
		if (annotation != null) {
			double annotationVersion = annotation.value();
			if (annotationVersion <= version) {
				return false;
			}
		}
		return true;
	}
}
